<?php
/**
 * @copyright	Copyright (C) 2005 - 2013 Open Source Matters, Inc. All rights reserved.
 * @license		GNU General Public License version 2 or later; see LICENSE.txt
 */

defined('_JEXEC') or die;

jimport('joomla.application.component.modellist');

/**
 * Methods supporting a list of banner records.
 *
 * @package		BaiToai.Nguyen
 * @subpackage	com_exercises
 * @since		1.6
 */
class ExercisesModelAnswers extends JModelList
{
	/**
	 * Constructor.
	 *
	 * @param	array	An optional associative array of configuration settings.
	 * @see		JController
	 * @since	1.6
	 */
	public function __construct($config = array())
	{
		if (empty($config['filter_fields'])) {
			$config['filter_fields'] = array(
				'id', 'a.id',
				'ques_id', 'a.ques_id',
                                'user_id', 'a.user_id',
				'state', 'a.state',
				'checked_out', 'a.checked_out',
				'checked_out_time', 'a.checked_out_time',
                                'nquestions'
			);
		}

		parent::__construct($config);
	}

	/**
	 * Method to auto-populate the model state.
	 *
	 * Note. Calling getState in this method will result in recursion.
	 *
	 * @since	1.6
	 */
	protected function populateState($ordering = null, $direction = null)
	{
		// Initialise variables.
		$app = JFactory::getApplication('administrator');

		// Load the filter state.
		$search = $this->getUserStateFromRequest($this->context.'.filter.search', 'filter_search');
		$this->setState('filter.search', $search);

		$state = $this->getUserStateFromRequest($this->context.'.filter.state', 'filter_state', '', 'string');
		$this->setState('filter.state', $state);
		
                $question = $this->getUserStateFromRequest($this->context.'.filter.question', 'filter_question', 0, 'int');
		$this->setState('filter.question', $question);

		// Load the parameters.
		$params = JComponentHelper::getParams('com_exercises');

		// List state information.
		parent::populateState('a.id', 'asc');
	}
	protected function getStoreId($id = '')
	{
		// Compile the store id.
		$id	.= ':'.$this->getState('filter.search');
		$id	.= ':'.$this->getState('filter.access');
		$id	.= ':'.$this->getState('filter.state');

		return parent::getStoreId($id);
	}

	/**
	 * Build an SQL query to load the list data.
	 *
	 * @return	JDatabaseQuery
	 */
	protected function getListQuery()
	{
		// Create a new query object.
		$db = $this->getDbo();
		$query = $db->getQuery(true);

		// Select the required fields from the table.
		$query->select(
			$this->getState(
				'list.select',
				'a.id AS id,'.
				'a.ques_id AS ques_id,'.
                                'a.user_id AS user_id,'.
				'a.checked_out AS checked_out,'.
				'a.checked_out_time AS checked_out_time, ' .
				'a.state AS state,'.
				'a.point AS point,'.
				'q.name AS questionname,'.
				'q.question AS question,'.
				'a.answer AS answer'
			)
		);

		$query->from($db->quoteName('#__exercises_answers').' AS a');

		// Join over the banners for counting
		$query->select('COUNT(q.id) as nquestions');
		$query->join('LEFT', '#__exercises_questions AS q ON a.ques_id = q.id');

		// Join over the users for the checked out user.
		$query->select('uc.name AS editor');
		$query->join('LEFT', '#__users AS uc ON uc.id=a.checked_out');

		// Filter by published state
		$published = $this->getState('filter.state');
		if (is_numeric($published)) {
			$query->where('a.state = '.(int) $published);
		} elseif ($published === '') {
			$query->where('(a.state IN (0, 1))');
		}
		
		$query->group('a.id,a.ques_id,a.user_id, a.answer,  a.checked_out, a.checked_out_time, a.state,  editor');
		
		// Filter by search in title
		$search = $this->getState('filter.search');
		$question = $this->getState('filter.question');
                if($question){
                    $query->where('a.ques_id = '.(int)$question);
                }
		if (!empty($search)) {
			if (stripos($search, 'id:') === 0) {
				$query->where('a.id = '.(int) substr($search, 3));
			} else {
				$search = $db->Quote('%'.$db->escape($search, true).'%');
                                $query->where('(a.answer LIKE '.$search.' OR a.comment LIKE '.$search.')');
			}
		}
		$ordering_o = $this->getState('list.ordering', 'id');
		if($ordering_o == 'nquestions')
			$ordering_o = 'COUNT(q.id)';
		// Add the list ordering clause.
		$query->order($db->escape($ordering_o).' '.$db->escape($this->getState('list.direction', 'ASC')));

		//echo nl2br(str_replace('#__','jos_',$query));
              
		return $query;
	}
}
